A 32-year-old man is brought to the emergency room by police after an altercation with a 28-year-old man with known HIV. The altercation started after a verbal argument and escalated when the 32-year-old man punched the man (who has HIV) in the mouth. The two men then wrestled on the ground, and the 35-year-old man was bitten multiple times on his arm by the man with HIV. On examination, the 32-year-old man has several open wounds on his right arm that are bloody and appear to be bite marks. The 28-year-old man with HIV has a swollen and bloody upper lip, as well as a partially dislodged and bleeding front tooth.